de.anbos.eclipse.logviewer.plugin.ui.EncodingDialog.java Source code

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Here is the source code for de.anbos.eclipse.logviewer.plugin.ui.EncodingDialog.java

Source

package de.anbos.eclipse.logviewer.plugin.ui;

import java.lang.reflect.Method;
import java.nio.charset.Charset;
import java.util.Iterator;
import java.util.Set;
import java.util.SortedMap;

import org.eclipse.jface.dialogs.Dialog;
import org.eclipse.jface.dialogs.IDialogConstants;
import org.eclipse.swt.SWT;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.widgets.Combo;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.Shell;

import de.anbos.eclipse.logviewer.plugin.ILogViewerConstants;
import de.anbos.eclipse.logviewer.plugin.LogViewerPlugin;
import de.anbos.eclipse.logviewer.plugin.Logger;

/*
 * Copyright (c) 2007 - 2011 by Michael Mimo Moratti
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 */

public class EncodingDialog extends Dialog {

    // Attribute ---------------------------------------------------------------

    private Logger logger;
    private Combo encodingCombo;

    private String oldValue;
    private String value;

    private boolean valueChanged;

    // Constructor -------------------------------------------------------------
    /**
     * @param parentShell
     */
    public EncodingDialog(Shell parentShell, String currentEncoding) {
        super(parentShell);
        logger = LogViewerPlugin.getDefault().getLogger();
        this.oldValue = currentEncoding;
    }

    // Protected ---------------------------------------------------------------

    /*
     * (non-Javadoc) Method declared on Dialog.
     */
    protected void buttonPressed(int buttonId) {
        if (buttonId == IDialogConstants.OK_ID) {
            value = encodingCombo.getText();
            if (!value.equals(oldValue)) {
                valueChanged = true;
            } else {
                valueChanged = false;
            }
        } else if (buttonId == 3) {
            doLoadDefault();
        } else {
            value = null;
        }
        super.buttonPressed(buttonId);
    }

    /*
     * (non-Javadoc)
     *
     * @see org.eclipse.jface.window.Window#configureShell(org.eclipse.swt.widgets.Shell)
     */
    protected void configureShell(Shell shell) {
        super.configureShell(shell);
        shell.setText(LogViewerPlugin.getResourceString("dialog.encoding.title")); //$NON-NLS-1$
    }

    /*
     * (non-Javadoc)
     *
     * @see org.eclipse.jface.dialogs.Dialog#createButtonsForButtonBar(org.eclipse.swt.widgets.Composite)
     */
    protected void createButtonsForButtonBar(Composite parent) {
        // create OK and Cancel buttons by default
        createButton(parent, IDialogConstants.OK_ID, IDialogConstants.OK_LABEL, true);
        createButton(parent, 3, LogViewerPlugin.getResourceString("dialog.encoding.defaults.button"), false);
        createButton(parent, IDialogConstants.CANCEL_ID, IDialogConstants.CANCEL_LABEL, false);
        //do this here because setting the text will set enablement on the ok
        // button
        encodingCombo.setFocus();
        if (value != null) {
            encodingCombo.setText(value);
        }
    }

    /*
     * (non-Javadoc) Method declared on Dialog.
     */
    protected Control createDialogArea(Composite parent) {
        // create composite
        Composite composite = (Composite) super.createDialogArea(parent);
        // create combo
        encodingCombo = new Combo(composite, SWT.LEFT);
        GridData data = new GridData(GridData.GRAB_HORIZONTAL | GridData.GRAB_VERTICAL
                | GridData.HORIZONTAL_ALIGN_FILL | GridData.VERTICAL_ALIGN_CENTER);
        encodingCombo.setLayoutData(data);
        // fill the encoding data
        SortedMap<?, ?> charsets = Charset.availableCharsets();
        Set<?> keys = charsets.keySet();
        // fill the combo with all available encoding types
        Iterator<?> keyIterator = keys.iterator();
        while (keyIterator.hasNext()) {
            Object obj = charsets.get(keyIterator.next());
            try {
                Method method = obj.getClass().getMethod("displayName", new Class[] {}); //$NON-NLS-1$
                String encoding = (String) method.invoke(obj, new Object[] {});
                encodingCombo.add(encoding);
            } catch (Exception e) {
                logger.logError("problem while resolving all available character encondings for this platform", e); //$NON-NLS-1$
            }
        }
        encodingCombo.setText(oldValue);
        applyDialogFont(composite);
        return composite;
    }

    // Public ------------------------------------------------------------------

    /* (non-Javadoc)
     * @see org.eclipse.jface.preference.FieldEditor#doLoadDefault()
     */
    protected void doLoadDefault() {
        if (encodingCombo != null) {
            String value = LogViewerPlugin.getDefault().getPreferenceStore()
                    .getDefaultString(ILogViewerConstants.PREF_ENCODING);
            encodingCombo.setText(value);
        }
    }

    public boolean isNewValue() {
        return valueChanged;
    }

    public String getValue() {
        return value;
    }
}